21201112122 has 8 divisors (see below), whose sum is σ = 42402224256. Its totient is φ = 7067037372.

The previous prime is 21201112087. The next prime is 21201112139. The reversal of 21201112122 is 22121110212.

It is a sphenic number, since it is the product of 3 distinct primes.

21201112122 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766759338 + ... + 1766759349.

It is an arithmetic number, because the mean of its divisors is an integer number (5300278032).

Almost surely, 2^21201112122 is an apocalyptic number.

21201112122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201112122 is a wasteful number, since it uses less digits than its factorization.

21201112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533518692.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201112122 its reverse (22121110212), we get a palindrome (43322222334).

The spelling of 21201112122 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred twenty-two".